Sol-gel preparation and enhanced photocatalytic performance of Cu-doped ZnO nanoparticles |
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Authors: | Min Fu Yalin Li Siwei wuPeng Lu Jing LiuFan Dong |
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Institution: | a College of Environmental and Biological Engineering, Chongqing Technology and Business University, Chongqing, 400067, China b Environmental Protection Bureau of Qijiang County, Chongqing, 401420, China |
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Abstract: | Cu-doped ZnO nanoparticles were prepared by a sol-gel method for the first time. XRD, XPS, UV-vis and FS techniques were used to characterize the Cu-doped ZnO samples. The photocatalytic activity was tested for methyl orange degradation under UV irradiation. The results show that the crystal sizes of ZnO and 0.5% Cu/ZnO nanoparticles with wurtzite phase are 32.0 and 28.5 nm, indicating that Cu-doping hinder the growth of crystal grains. The doped Cu element existed as Cu2+. The optimal Cu doping concentration in ZnO is 0.5%. The optimal calcination condition is at 350 °C for 3 h. The MO degradation rate of 0.5% Cu/ZnO reaches 88.0% when initial concentration of MO is 20 mg/L, exceeding that of undoped ZnO. The enhanced charge carrier separation and increased surface hydroxyl groups due to Cu-doping contributed to the enhanced photocatalytic activity of 0.5% Cu/ZnO. |
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Keywords: | ZnO Cu doping Photocatalysis Sol-gel Methyl orange |
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